There's all sorts online!
There's the Pirkei Shoshanim site which offers a series of structured halacha courses some of which are based on gaining semicha, as well as plenty of others for example a course on the Laws of Pesach which is made up of three chapters the first two are made up of 13 lessons each, with the last containing 11 lessons. The cost for this course in particular is $180, which comes out at just over $4 a video! Each of these chapters ends in a test which allows the viewer to fully consolidate all that they have learned.
For younger viewers I highly recommend Dan Roth's Torah Live which also has a series of courses split into bitesize videos.
Alternatively, for free you can peruse the Torahanytime site which has literally thousands of shiurim of which many maggidei shiur run series on certain topics.
There's also the Aleph Beta site which has nice small videos.
Finally the Chabad site has a full archive of videos, many of which are part of a series.